Knife for splitting machines



May 17, 1927. V J. J. HEYS ET AL KNIFE FOR SPLITTING mcamss FiledJan.;so.- 1924 Patented May 17, 1927.

, UNITED STATES PATENT 'orFrcE.;2-

JOHN J. HEYS, oi" LYNN, AND ALBERT a. BRAnEmor nEvER'nY, MASSACHUSETTS,"

ASSIGNORS TO UNITED SHOE MACHINERY CORPORATION,- OF PATERSON,- NE?JERSEY, A CORPORATION OF NEW JERSEY.

KNIFE FOB SPLITTING MACHINES.

Application filed. January 30, 1924.. smart... 689,471;

rolls. These knives are sometimes made of a. single piece of toolsteeland sometimes of a blade of tool steel welded to abody, portion oflow-grade steel. In either case the finished knife is rigid throughoutand is really a one-piece construction. After knives of this kind havebecome sufficiently Worn away by successive sharpenings, they arediscarded and replaced by new ones. Moreover, such knives, particularlywhen made entirely of tool steel, tend to become slightly distorted ifallowed to stand in the stock room for afew weeks, this distortion beingprobably dueto the slots formed in'them for *thepassage of the boltsbywhich they are adjustably clamped to the knife support.

l Vith a view to overcoming these disadvan tages, the present inventionprovides a novel two-part knlfe compr sing a body portion {and areplaceable blade. In the illustrative :construction the body portionand-blade are ,held together by a snap fastener so that the {two-partknife can be handled just as in ,the old form; and, in order to clampthe two parts firmly in place upon the knife support,

, ,a clamping member of particular form is worn out, the body portionremaining in-.

embodied in an illustrative machine and With such a construction theprovided.

be removed and replaced when )blade can tact and the blades being ofsmall extent and unslotted donot cause trouble by war ingr 1 1 T iis andother features of the invention, including certain details ofconstruction and combinations of parts, will be described as pointed outin the appended claims.

Referring now to the accompanying drawings,

Fi gure. 1 is a vertical longitudinal, sectional view of a portion of aleather skiving machine in which the present invention is embodied;

. Figure 2 is a plan of the two-part knife, and I Figure 3 isa detail inperspective showing more particularly the means for holdin g the twoparts of the knifetogether. i The machine chosen for illustration is acounter skiving machine of the general type i of that shown in PatentN0.-1,17;3,359, grant ed Feb. 29, 1916, upon an application filed 1n thename of Lane. It comprises afeed roll 1, a matrix roll 3,2; series ofpresserfingers 5 and a knife sup ort 7, which is part i of the frame ofthe mac' line and has afflat upper surface upon which the knife rests.and over which the knife is adjustable. It

will be understood that the rolls are rotated in a direction to causethe leather bla nk-to be fed to the knife Whichskives ofi thatportionofthe blank which projects above the matrix 9 of the roll 3. No;further 'description of the construction andmode of operation of themachine will be given, ref erence being made to the patent; Moreover, itshould be understood that the particular type of machine which hasbeen'shown has been chosen merely for illustrative purposes form of anopen ring 210i spring steel which I I is inserted in av circular groove23, said. groove being formed partly in the blade 13 and partly in thebody, portion 1 5. The spring ring holds the two parts of the knifetogether quite firmly so that the knife can be adjusted toward and fromthe rolls as may be required. v i

The knife rests, as shown in Fig. 1, upon the flat upper surface of thesupport 7. It is necessary to .clampthe knife firmlyin place, and it isespecially zdesirable that the blade be clamped to the support asnearthe cutting edge of the blade as possible so that the edge shall notgive or spring during the cuttingoperation. To this end as well as toensure that the body portion 15 shall also be firmly clampedto thesupport? irrespective of any slight variation in thickness of the bladeand body portion, there is provided a clamping member 25 in the form ofa plate which is slightly hollowed out on its underside, as shown inFig. 1. .The rear portion of this plate engages the body portion of theknife somewhat to the rear of its middle, while the forward portion ofthe plate engages the blade along a locality adjacent to its outingedge. Cap screws 27 pass through suitable holes in the clamping plateand are threaded into the knife support. The clamping plate thus holdsthe knife in adjusted position on the knife support in such manner thatthe tendency of the knife edge to spring during the cutting operation iscounteracted. In order to provide for accurate adjustment of the knifetoward the rolls, two adjusting screws 29 are threaded into the knifesupport and engage suitable shoulders on the body portion 15 as shown.

Although the invention has been set forth as embodied in a particularconstruction, it should be understood that the invention is not limitedin the scope of its application to the particular construction which hasbeen shown and described.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent of the United States is 1. A two-part knifecomprising a body portion having a flat under surface, a blade ofsubstantially the same thickness as that of the knife and also having afiat under surface, said blade being located in front of the bodyportion with the rear edge of the blade abutting the front edge of thebody portion, and a member for holding the parts together, said memberbeing capable of manual manipulation from operative to inoperativeposition whereby the blade and body portion may be readily detached fromeachother at any time.

2. A two-part knife for a splitting machine, said knife comprising abody portion, a blade and a resilient member for holding the two partsdetachably together, said body portlon and blade having surfaces locatedin the same plane and adapted to rest upon a flat supporting surface ofthe machine.

3. A two-part knife adapted to rest upon a support, said knifecomprising a body portion and a blade, means detachable from the bladeand body portion for holding the two parts detachably together, andmeans for engaging the two pars and clamping them to the support.

4. two-part knife adapted to rest upon a support, said knife comprisinga body portion and a detachable blade, means for holding the two partsdetachably together, and means for clamping the two parts directly tothe support, said clamping means including a plate hollowed out on itsknifecontacting face and contacting at its ends respectively with thebody portion and. with the blade.

5. A two-part knife for leather splitting machines comprising a bodyportion, and a replaceable blade, a resilient member adapt ed to holdthem together, and means for clamping the parts to the support.

6. A two-part knife for leather splitting machines adapted to rest withboth parts upon a support comprising a body portion, and a replaceableblade, a resilient member adapted to hold them together, and means forclamping the parts to the support, said means comprising a platehollowed out on its knife-contacting face and adapted to engage theblade along a locality near the cutting edge thereof.

7. A two-part knife for leather cutting machines comprising a bodyportion and a replaceable blade adapted to rest upon a support and meansfor clamping the parts directly to the support, said clamping meanscomprising a'plate hollowed out on that face which contacts with theparts of the knife.

8. A two-part knife for leather cutting machines comprising a bodyportion and a replaceable blade adapted to rest upon a sup port, thecontacting edges of the two parts being straight, and means for clampingthe parts directly to the support, said clamping means comprising aplate hollowed out on that face which contacts with the parts of theknife.

9. A two-part knife for splitting machines comprising a .body portionand a detachableblade adapted to rest upon asupport with the rear edgeof the blade abutting the front edge 'of the body portion, means wherebythe two parts may be adjusted in unison over the support, and means forclamping them both directly to the support.

10. A two-part knife comprising a body portion and a detachable bladeadapted to rest upon a support with two of theiredges in contact, meanswhereby the two parts may be adjusted in unison over the support andmeans adapted to engage the parts in two separated localities but notbetween said localities to clampthem directly to the support.

11. A two-part knife comprising a body portion and a replaceable bladeadapted to rest in abutting relation upon a support, interengaging meansfor holding the two parts detachably together, a clamping member adaptedto engage the blade along a locality adjacent to the edge thereof, andmeans for drawing the clamping member toward the support to clamp thetwo parts of the knife directly to the support.

12. A twopart knife comprising a body portion and a replaceable bladeadapted to rest in abutting relation upon a support, inter-engagingmeans for holding the two parts detachably together, a clamping memberadapted to engage the blade along a locality adjacent to the edge*thereof, means for drawing the clamping member toward the able from thebody portion and the blade support to clamp the two parts of the knifefor holding the two parts cletachably t0- 0 to the support, and meanswhereby the parts gether, and means for engaging the two may be adjustedin unison along the supparts and clamping them to the support.

port. Intestimony whereof we have signed our 13. A two-partknite adapterto rest upon names to this specification.

a support, said knife comprising a body por- JOHN J HEYS.

tion, an imperforate blade, means detach- ALBERT R. BRADEN CERTIFICATEOF CORRECTION.

Patent No. 1,628,840. Granted May 17, 1927, to

JOHN J. HEYS ET AL.

ge 3, line 6, claim 13, read "adapted"; and that the said Letters Patentshould tion therein that the same may conform to the record of the casein the Patent Office.

Signed and sealed this 11th day of October, A. D. 1927.

M. J. Moore, Seal. Acting Commissioner of Patents.

